What does self-publishing mean?

Self-publishing means that you’re not only registered as a writer but also set up a body to serve as your publisher. When self-publishing your music, you hold all the rights, IP, publisher’s credit, and songwriter’s credit. You get all the royalties and full control of the compositional copyright. But, in turn, you have to take on all of the duties of a publisher as well.

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Source: How to Publish a Song: 6 Pros and Cons of Self-Publishing Music